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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b1c4594df12ebb14294aca559c59e09c7c21ff6b67d7ebccac01a3ed5ae60d' 
  AND token = 'UMM7jSG9g9aTnjDVI0+85OryKWaQ7m+zoTLRzp4JLi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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