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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675d5f47733edbaa3b9c24a68f7e13ba37c9f5a64a11db8b787e7654c6b2ba93' 
  AND token = 'etcgs7us9iG0r7TtmmEMZGNhR6bsVozSppgIUKvDb/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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