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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5efb6e6b704ab5f75716182f926d81e0310d247af7348a728e27ab620d79c6' 
  AND token = '0XZ6t0okJiwL53Iyfmvz+KXkP2OETqx4upJ8CmQxGF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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