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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af4bb61e8bdf26bee3b5661c7c446d6a162fc8c2ab9ad25ed1a1743bf99a9cc' 
  AND token = 'i0UrMTlgaafwrbqDEaWa4TY/BRXj3LrDEpwETgBX6QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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