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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5691035a66d2b3517926c940a7986f5f64db80384b1f6d1f307c8df08f3dcc90' 
  AND token = 'JjT6m9a09quUyZv9RmD+h/8neee65FTQuyfMidbGy4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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