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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1ff538e1c3d57eea1d9514f52f0986169ca50a2d1f507928949ad4c03792c0' 
  AND token = 'vh86D3qyl1iKQFcpcAS+ZcGdlOZtCYjMbMU6zWTG948=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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