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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e2e20a60899b167b42d6a61a6fab4ef976f3fd54a86c93d436971c544f9e04' 
  AND token = '7aBO9nDA9STGNgshB/kJMucf7SKEh+VoKi4aKYa3dlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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