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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589c6cf74219e11ad84c0d5eb7a617fe4756233ee2feff58f6eb17559855bee7' 
  AND token = 'q8+bf4Oc7K9V6iai3yUzqiOZZrqVpNYqR6dsWGrxKDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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