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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c11cdd53c9d127da5927cfe61a2d208392ffc24d2c81b30c97ee8928401fa3' 
  AND token = 'Y+A+zzZ79z64/9QAKXjNFMPBTTNLiYMKtoSXybnsTBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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