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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7823128b5239c59746734697bf3c091341a0b21f6eab3521069438f5b546aea1' 
  AND token = 'enorfGIr7Sov1W1arHrD0erxvXDDQU57UptgFUVBh/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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