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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbae891dbb00c43d263ee9201c4c3b148535ab689bdc1abca30401584c98fb0' 
  AND token = 'dUihQ6nonJielWfT4VJE5ZPiekxdlOqo/mHBKAwCRsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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