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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26f81224af8a937e4575dfcebf1e927187769b693e27b8ffdf6c8405b463fec' 
  AND token = 'tR40fzG1AQc7bV7QVF5fxB4AwM4oN8GHtsnrqrB8ogY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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