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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc79aa829eda9642db42a7f1b0a1d1767321cb41c798a80437db92e0818925e9' 
  AND token = 'tOip8ov5gMBkpSMf1WHa8QSMRiD++4+IdSIFe2EEFeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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