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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679cf82dd5843a591487c232af06d79cc3fb2d5156445139b7cef1720e6d5a0f' 
  AND token = '3ltmKsZtqSYMMLJM7fWQb7X+Z9LrnXUlbecBZcDVDTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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