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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1983d146a14273cef2e52b5660fe195c2ee40d46b3d9a0b5790c3104a391600' 
  AND token = '3QECmLxDO3gPINOqKmIpBo6cnsq48xt6xgYCwvGyO0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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