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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a1c9b2cb0ed48088b4d22f3233e603a560d1304c9aee91b26c666c6e4a6402' 
  AND token = 'xr6UqmsFQNX6RfUw6VGZ8oTspqKIMhxNhWUDv13wHp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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