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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809f9bedebf4358bd9b025039b92fe48894db60c60b522a3a910afe4ba33c2fc' 
  AND token = 'eNDm9L/6U7w7gt1VfeNEzNEY1L6H9JNMzp+Dgp+3raM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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