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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c2321519183aa418d4d6eaebac2bfa258da0369c54fc6b147cc244c52b35df' 
  AND token = 'SCirR0fCwxJpDC/P/dwhNZ4vl8SJEu8afqa9cX3n/ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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