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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b8cc83c34b7112121e078cab5f9430109c72f43fe7f8bf1388ee0df96cffbd' 
  AND token = '0/j0SVQjXP46O0z0KgbSqWuJMc5HRdvMyZ4mlWMcWqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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