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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44fd7f6b664d2a3b65eb18afd55fe5aee9f03b9ece382df620df9a1180b12b7' 
  AND token = 'a7Z8fzelCM49YPhhimMS6sY/ugfqe6wi5oSMnmgj3Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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