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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402bd84a0a13702503678c055f48c5b507e9ca2a2017b9a32a4c5c85ee585963' 
  AND token = '6SenIB4J6hqgL6KszHseutZWMoX0gPWvvYygKR3Sr1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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