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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dcf91fb6085fc914a4817b797cb93d1e0ab5d2e0e6777e0aa78c6ec90a21ca0' 
  AND token = '2rZ22l7Ss1eLJM63orgBRMgObzmCMD897UwwrWC8xDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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