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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1b2cffffc445ffa1b5f5826dcae02f033be248f52e086f6e7c581ccfc0caf8' 
  AND token = '5RIrZUaay13kPCQF8TyB0oAReu7r+Nxi31lpj1ARF6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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