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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3789949149fd565d121c612d7d68d5ba26e2f99ff569cf99d5f51f8247ab3a' 
  AND token = 'INbtYTAAUQEWMEqnD2u7KQYoy/zdNTg6A89UG0PRjFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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