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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570eacdd24bbfab7402bc70a5956c1ec441011d0b24d5acb3dc4c13c4880c9d6' 
  AND token = 'AvRCniZNVHeU6EuHMj9SOlBrlGoJdkjwAw9YPxaW1OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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