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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab362423d3523414ee1f7c29b5fa9daa3c101188ec04243118fa745377d87a8c' 
  AND token = 'QkIMitqL0WLybsArldk9mI3Rs9tsoIKnmMZMV4fLM8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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