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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ed0c9a93f350e427ba88928adb38a2d20b2bbbe2d4e8a0b003b8a3c7409ccd' 
  AND token = 'z68bUywttKKSoshhricq9yDLbKDYwIf5vgwvEVYkNRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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