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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c466572490f3de11e9be47c61c89bbf99d576ca5cfab8a3caba95293b10b05b' 
  AND token = 'Tma3PQ3gTKxJc7NgutFDmIWXtZaGbJahpVi7rqLiOE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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