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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de31884e89875e78a100f5231b197eedf40e4347d5ac56716a332a7b47f9250b' 
  AND token = 'y7aqEl7HyagD+ERiy9rMqpeQOOypHoCPnmBQ++DYJ+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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