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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ad92e1db9f8f915a407cff547adbc3da03f1a54883a3e45fea1a90d7313b15' 
  AND token = 'LOz0Onm/nNkceo6N09s7SC8cTVmr1uDnI5KKYZcLwL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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