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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa211bcab31c0c735b0fe84ce98452264fc4b58ed55ed0a7ac62886c011e95c' 
  AND token = 'wnGcsz2Bkb7h47cR02732ip0M2yLK6QjmTrU0elgAWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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