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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8a578f7d1768bc78765e63392767b09e0feb50884b76c86d2dff732ea239ee' 
  AND token = '0mOXZ/YUOv//HITp4GE7xF/k5WkBlQsBGQexSUoJkoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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