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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bce651e2ffc9c4c1bcc961ff41a360fa96c508ca4c10be7c070f7894379482a' 
  AND token = 'y01dhDvVjvQpL9DWentcxF+eY77XB1rXETNEe9cpiRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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