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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3f223d655f6ff35f52bdbea42aa6ffdb29a3f9cd097bc49a0469b62a50eb32' 
  AND token = '4KiTNsjrO45XKo51dyfMxOj9EjkDWAzDyjq+JRZjI0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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