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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf242120584c773f9f0f1b72519f7c3da6440cde15f628fdb9538855eb9556c2' 
  AND token = '4KI1K43W3pXbsuKBGducpVlU+QXfu9iE7G5ypRG0hr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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