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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0104c381e12c4ea217a3818734ea0b5f4e5ef17baf84c61fa5ee10e1bc05f05' 
  AND token = 'W4yiwM9fc+LW6NxuWfrGtJH5D+BjA5Kt2XSEUYluhOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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