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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb9bcec0369a3f30287858d8c00844a9d0750cf37f899c623d09738e02aaba3' 
  AND token = '/SaAv87T15i5ezFEXSLQJWp/8WbYDDdtMKh4zDal6E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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