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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e057fee8e7662d3e2eb69577b8c3c95a9e341cb945e0e8ec8cf827e6c266064' 
  AND token = 'koHPya2zZdWkFtcxDUlEJ5dl5nzkd8KRseBhbOjeOow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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