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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0394e4a4f6feeb0384c5c46e6fb5e4c4c70f00710bee8d5f7ac37280c4c84c9f' 
  AND token = 'nwG52KUGOPfmePBMcPB0wFRVRLqXyiea9m8cYiVWARk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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