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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86eb651b519c46e7f939421e22ae9987719032ef1e68ce0229e603ac781edc78' 
  AND token = 'eTHTB25xk8sQUVb7j1PatNGHipWoh1l5w3ngZ1OU5uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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