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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99eab1469f222c544d8230ba5445dfbcebde7ab8d7e29b6c13ca2fb4afaf7715' 
  AND token = '/KsiP7+g4EqHWwI8fNab7omPIMkPU7+/oUxW99Jk+qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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