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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c311113f1b76a5b0590a8c94c82dc9a3b3381415e81d7b05ce4419881938bcba' 
  AND token = 'Wt1391TGMu8B6+StwWM8aN3J/abSq8gzP2qo/MNCgQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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