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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d3432dbbe210a4f1db6afca06f1627fac0e2a0e66dc54ab88f62a82536843e' 
  AND token = 'd5KGvjfdXqVgDjuvJrmSfsalGVx19qEO2PN5E9s4fD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}