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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11267aa92fd23b28ee24475c7271ae8d3deefff1c884d3bbe9f28fd66ba7b35a' 
  AND token = 'iDEpkvRSyZQbPBZOaaC/7Uug2plM9cuIrA2JZpc+GaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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