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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898b2246c5048917efbcf4bd1d5a71d4bbff7868b1146e2c6a26a109b5800f72' 
  AND token = '2zwJ3H/v16RESboN4gKjs9IWgi3pWBAoDD3zH8MBU6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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