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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79e3ce63554ea1d261be69c88411b6489fe889d0e37a026c27c75223d8c8cdb' 
  AND token = 'YI8Crqy2xJ/RQERC0cJqSPabNfC9FU3HpReCGRnPIEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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