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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d0a360700872fb922150d8b521eb8cd71d142c1b7a9286ebe130cb80e33771' 
  AND token = 'mtV+8UcgnHykJoRWVu1b/GNatwog8jG5LYFI+QmNeqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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