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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2260a378f37d6d08d0da286eaa65c1173caefb98a4ba3dd67e08e59b894fdca1' 
  AND token = 'D1t9IDloXZBWRN91RczCwsz77ktXHAnNz0UkQL5GMeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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