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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2d82abecb261a7c10e99a3a3dfd19bbe7ea4461cd7283c1db9c1bda3cb4220' 
  AND token = 'lCyn8Aoy0wKtUY8+MX7z5BW0h7YIGFwlnRof+Y/0v68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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