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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ff8efd2babc703be8b2e7a2a673a215c3e5ac3165a41f3196275399cde0381' 
  AND token = 'ypKyVkxtZeTylxvoI6Mx73Va7Os/BKQwIViS8Aw19u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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